Waste-to-Energy Combustors Combustion system consists of:storage pit,a crane,a combustion chamber consisting of bottom grates on which the combustion occurs ,the furnace or combustion chamber,the heat recovery system of pipes in which water is turned to steam, the ash-handling system,and the air-pollution control system. o units produce steam in a boiler located at the top of the combustion chamber grates provide turbulence for complete MSW burning,to move the refuse down and through the combustion chamber UNEP Waste-to-Energy Combustors  Combustion system consists of: storage pit, a crane , a combustion chamber consisting of bottom grates on which the combustion occurs ,the furnace or combustion chamber, the heat recovery system of pipes in which water is turned to steam, the ash-handling system, and the air-pollution control system.  units produce steam in a boiler located at the top of the combustion chamber  grates provide turbulence for complete MSW burning, to move the refuse down and through the combustion chamber